Charles



To all whom it may concern:

UNITED STATES PAT NT OrFIcE.

CHARLES J. nnnns, on NEW YQBK, ,N. Y.

BOTTOM FOR REDUCING-FURNACES.

SPECIFICATION formingpart of Letters Patent No. 428,747, dated May 27,1890. A raise filed January 30,1890. Serial No. 338,683- (No model.)

Be it known that I, CHARLES J. EAMES, a citizen of the United States,residing at New York city, in the county and State of New York, haveinvented certain new and useful Improvements in Bottoms forReducing-Eurnaces; and I hereby declare the following to be a full,clear, arid exact description-of the same, such as will enable'others toapply the invention.

My invention relatestothe production of certain neutral or basiccompositions for the formation of the bottoms of reducing andothenmetallurgic furnaces, and has for its object to obtain a smooth,durable, non-wearing bottoni; on which metallurgic operationssuch as thereduction of ore, desulphuriza tion and dephosphorizat-ion of ore,drew-can be conducted without any irregular cutting or destruction ofthe bottom, and without. such waste ,of the bottom as shall modify,"change, aife'ct, or delaythe metallurgic pro-' cesses conducted in saidfurnaces.

To this end my invention, generally stated, consists in aniisture orcompound forfur nace bottoms wherein dolomite or magnel. sia-n limestpneand a solid carbon, the carbon acting to excludeoxygen fromtheflime andretard waste, arecombiued with one or more surface for spar to completethe mass and obtain a glazed-- the bottom, all substantially ashereinafter more fully appear.

1 will now proceed to describe the preferi'ed proportions of theelements, as well as the preferred manner of uniting and applying thesame, so as to enable others skilled in the art to carry out theinvention; but I distinctly disclaim limitation to said propor Incarrying out my lnvention I preferably take seventy-five per cent.,'(7 5by weight,

of dolomite, ten per cent, (10%,) by weight, of a solid carbon,preferably one devoid of hydrocarbons, such as coke or graphit-iccarbon, seven per cent. (7%) of fire-sand, six per cent. (6%) fire-clay,and two per cent. (2%) fluor-spar.

Such of the above elements as require itviz., the. carbon, dolomite, andfluor-sparare reduced to a granular condition by any suitable means, andall the elements are then intimately mixed and worked into a plasticmass by means of a pug or other suitable mill and ,the addition of a.suitable liquid, I preferably a weak solution of silicate of sodasay one.(1) pint silicate of soda to about five (5) gallons of water; and themixture or mass "thus'fornid is then applied-to the furnacebottorn. in alayer varying from four (4) to ten' (10) inches in depth, according tothe size of the furnace and character of metallurgic process to beconducted in said furnace. The said mixture is applied to the coldfurn'ac'e and'the furnace gradually fired or heated toy-drive elf themoisture, the heat being finally raisedtovitrify or glaze -the surfaceof the bottom.

w The nietallurgic processes subsequently conducted in'afurnac'e havingsuch a bottom will ultimately fuse the bottom for adepth .of perhapshalf an inch or so; but, owing to the protection afforded to thedolomite by the carbon and the virtual exclusion of oxygen from thedolomite, the waste of the bottom is exceedingly slow and so slight witheach charge. as to have no material effect on the charge,

The bottom hereinbefore described is exeeedingly durable, and, as itretains a glazed uniform surface, facilitates the handling of the chargeworked thereon.

Having thus described my invention, what;

I claim, and desire ent, isv 1. A composition for furnace-bottoms,composed of dolomite, carbon, and binders, including fluor-spar,substantially as and for the purposes specified.

to secureby Letters Patf 2. A composition for furnace-bottoms, com )9 5posed of dolomite, carbon, and the binders fluor spar, fire. clay, and,fire sand, substantially as and-for the purposes specified.

